Hi Sue with the Chonda ones (I think the Honda ones may be different) it is 55mm in diameter and about 40mm deep. What I had to do was bore the center to suit the shoulder on the Victa nut and then I cut about 4mm off the top of it removing the flange. That left the ribs in the cup exposed, I then knocked them down a little bit to give a bit more clearance to the starter. Works like a dream
